Error code reference

Samsung Heat Pump Error Code E403

Compressor down by compression ratio control - ratio of (High pressure + 1)/(Low pressure + 1) exceeds 8.5 for over 10 minutes.

SourceSamsung Heat Pump - Service Manual: Troubleshooting (AVXWHH071EA)p. 11-10, 11-22

Samsung codes Samsung heat pump codes

Diagnostic procedure

The full E403 procedure

Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.

MyPros+ · DiagnosticsStep 1 preview

First diagnostic step

Connect S-net and manifold gauge; check if service valve is fully opened; compare S-net with manifold gauge readings.

SourceSamsung Heat Pump - Service Manual: Troubleshooting (AVXWHH071EA)p. 11-10, 11-22

Unlock with pass

More steps, wiring diagram references, and verified part numbers

Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.

Unlock E403 procedure $9.95

Or subscribe: $29/month for all codes plus Max diagnostics, with 70 Max messages a day. Plus applicable tax.

Where this code is documented

10 manuals in the MyPros+ library document this code for Samsung heat pump.

Models covered by the manuals that document this code

75,000+ service documents · 20,000+ error codes · 100+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass · Plus applicable tax

The full E403 procedure

Where this code is documented

Models covered by the manuals that document this code

Related Samsung heat pump error codes